Lesson 44 (12:08)
SLOPE
Mrs. Sampson's science class is
running an experiment to find the
rate of water absorption in a vase
of flowers. The students measured
the depth of water every two days
and graphed the results.
8
7
Depth of Water (in)
the steepness of a line
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
Day
SLOPE is the UNIT RATE
of change. How much does
it change per unit?
What type of slope does the line have?
Calculate the slope (or unit rate of change):
=
y=
x
1
2x
x
1 day
–5
y
(x, y)
–2
0
2
y = –2 x + 5
y – 2 = 3x
t = –4s + 3
x
y
(x, y)
x
–1
–3
0
0
2
2
y
(x, y)
Lesson 44 (12:08)
SLOPE
Which equation has a slope of 4?
A.
B.
C.
D.
y = 2x – 4
y = –2x + 4
y = 4x – 2
y = –4x + 2